Welcome to the
Time and Frequency section of NMISA
The Time & Frequency (TF) Laboratory maintains the National Measurement Standards for the fields of both Time and Frequency.
- The National Measurement Standard for Frequency is derived from an ensemble of atomic clocks consisting of six thermal beam caesium atomic frequency standards and three active hydrogen masers
- One of the frequency standards mentioned above is actively steered towards a prediction of international time (called Coordinated Universal Time or UTC) and currently have a time error of less than 20 nanoseconds.
- The Time & Frequency laboratory is accredited by SANAS (laboratory number 1604) since July 2003.
The following measurement and calibration services are available. All of these services are accredited.
- Frequency (e.g. oscillators)
- Time Interval (e.g. time delay generators, stopwatches, timers)
- Rise- and fall-time (e.g. pulse generators, oscilloscopes)
- Phase angle (e.g. phase angle meters, generators)
- Rotational speed (e.g. tachometers)
The area is currently developing new or improved measurement techniques in the following areas:
- Time scale accuracy
- Calibration of geodetic GPS receivers for internal time delay
- Remote time transfer using either GNSS common-view techniques or time transfer over fibre
|Chris Matthee||Time and Frequency Metrologist|
|Steff Roux||Photonics Research|